&OPTIMISE: BACKGROUND-FIELD


formula

  The background field should be entered as formulae in terms of
  the following variables:

  ---------------------------------------------------------------
  Variable      Meaning
  ---------------------------------------------------------------
  X (or R)      x- or r-coordinate
  Y (or PHI)    y- or phi-coordinate
  Z             z-coordinate
  EXMAP         x-component of the background electric field map
  EYMAP         y-component of the background electric field map
  EZMAP         z-component of the background electric field map
  VMAP          background potential field map
  ---------------------------------------------------------------

Keyword index. Formatted on 10/11/98.